Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 321 · 40 questions

The trick (Last digits only): Multiply (or add) only the last digits of the two numbers. The last digit of that result is the last digit the answer must have. Different last digit → wrong for sure. Same last digit → it passes the check (work it out in full to be certain).

1. 1.Last-digit check: is 61 × 70 = 4270 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 74 × 45 = 3330 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 48 × 72 = 3456 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 30 × 39 = 1170 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 45 × 37 = 1660 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 72 × 44 = 3159 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 480 + 148 = 628 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 56 × 92 = 5152 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 288 + 995 = 1283 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 696 + 944 = 1634 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 453 + 343 = 796 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 49 × 48 = 2357 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 71 × 41 = 2911 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 206 + 213 = 424 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 12 × 18 = 221 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 17 × 77 = 1304 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 873 + 318 = 1191 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 92 × 61 = 5609 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 574 + 642 = 1218 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 761 + 746 = 1507 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 25 × 35 = 869 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 14 × 30 = 414 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 661 + 216 = 883 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 97 × 31 = 3008 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 29 × 28 = 809 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 95 × 65 = 6169 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 31 × 92 = 2849 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 519 + 899 = 1418 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 99 × 90 = 8905 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 98 × 92 = 9016 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 622 + 112 = 740 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 59 × 24 = 1416 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 59 × 12 = 701 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 52 × 71 = 3686 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 251 + 731 = 990 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 432 + 927 = 1350 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 911 + 513 = 1423 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 18 × 24 = 432 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 697 + 194 = 891 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 166 + 991 = 1157 right or wrong? (a) Right (b) Wrong

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